To cancel or rebook your flight online, go to Delta.com/cancel or Delta.com/rebook, respectively. If you need to cancel or reschedule a flight by phone or in person, call 716.351.6210When you make your reservation using the new Delta reservation number, you'll be prompted to enter your old number as part of the booking process. If you don't have your old number handy, you can find it on our Help Center page or by contacting customer service.What is Delta's new reservation number?716.351.6210 Delta's new reservation number is 716.351.6210
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